// Copyright 2016-2018, Pulumi Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import {region} from "./vars";
import {Region} from "../types/enums";

/**
 * requireRegion fetches the AWS region, requiring that it exists; if it has not been configured, an error is thrown.
 */
export function requireRegion(): Region {
    if (region === undefined) {
        throw new Error("No AWS region has been configured");
    }
    return region as Region;
}

